Skip to content

Add Sierpinski topos (category of set functions and commutative squares)#264

Merged
ScriptRaccoon merged 2 commits into
ScriptRaccoon:mainfrom
dschepler:sierpinski-topos
Jul 4, 2026
Merged

Add Sierpinski topos (category of set functions and commutative squares)#264
ScriptRaccoon merged 2 commits into
ScriptRaccoon:mainfrom
dschepler:sierpinski-topos

Conversation

@dschepler

Copy link
Copy Markdown
Contributor

This is mostly meant as a comparison point for the full subcategory Mono of injective set functions, which will serve as an initial example of a quasitopos which is neither an elementary topos nor thin.

@ScriptRaccoon

Copy link
Copy Markdown
Owner

Thank you! This looks good. I have made some adjustments; please check.

Comment thread databases/catdat/data/categories/Set_arrow.yaml
Comment thread databases/catdat/data/categories/Set_arrow.yaml
@dschepler

Copy link
Copy Markdown
Contributor Author

The adjustments look good.

@ScriptRaccoon ScriptRaccoon merged commit 0b8348f into ScriptRaccoon:main Jul 4, 2026
1 check passed
@dschepler dschepler deleted the sierpinski-topos branch July 4, 2026 13:27
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Labels

Projects

None yet

Development

Successfully merging this pull request may close these issues.

2 participants